Automatic row control method and system for harvester

The invention discloses an automatic row control method for a harvester, and the method comprises the steps: enabling a header of the harvester to sense whether the header touches a target object or not in real time, and calculating the offset of a detection rod of the harvester at the current moment when the header is about to be separated from the target object if the header touches the target object; acquiring the working speed of the harvester at the current moment through a vehicle-mounted sensor; calculating an included angle between a detection rod of the harvester and the target object row at the current moment; calculating an included angle between the current operating speed of the harvester and the component of the operating speed in the row direction of the target object according to the operating speed of the harvester at the current moment; according to the offset of the harvester detection rod at the current moment, the operation speed of the harvester at the current moment and the included ang